Allow MAX31865 resistance values configuration (#19695)
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@ -432,6 +432,12 @@
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#define DUMMY_THERMISTOR_998_VALUE 25
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#define DUMMY_THERMISTOR_999_VALUE 100
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// Resistor values when using a MAX31865 (sensor -5)
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// Sensor value is typically 100 (PT100) or 1000 (PT1000)
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// Calibration value is typically 430 ohm for AdaFruit PT100 modules and 4300 ohm for AdaFruit PT1000 modules.
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//#define MAX31865_SENSOR_OHMS 100
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//#define MAX31865_CALIBRATION_OHMS 430
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// Use temp sensor 1 as a redundant sensor with sensor 0. If the readings
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// from the two sensors differ too much the print will be aborted.
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//#define TEMP_SENSOR_1_AS_REDUNDANT
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@ -1845,6 +1845,10 @@ static_assert(hbm[Z_AXIS] >= 0, "HOMING_BUMP_MM.Z must be greater than or equal
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#error "TEMP_SENSOR_1 is required with TEMP_SENSOR_1_AS_REDUNDANT."
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#endif
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#if ENABLED(MAX6675_IS_MAX31865) && (!defined(MAX31865_SENSOR_OHMS) || !defined(MAX31865_CALIBRATION_OHMS))
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#error "MAX31865_SENSOR_OHMS and MAX31865_CALIBRATION_OHMS must be set in Configuration.h when using a MAX31865 temperature sensor."
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#endif
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/**
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* Test Heater, Temp Sensor, and Extruder Pins
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*/
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@ -1461,7 +1461,7 @@ void Temperature::manage_heater() {
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#elif ENABLED(HEATER_0_USES_MAX6675)
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return (
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#if ENABLED(MAX6675_IS_MAX31865)
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max31865.temperature(100, 400) // 100 ohms = PT100 resistance. 400 ohms = calibration resistor
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max31865.temperature(MAX31865_SENSOR_OHMS, MAX31865_CALIBRATION_OHMS)
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#else
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raw * 0.25
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#endif
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@ -2236,7 +2236,7 @@ void Temperature::disable_all_heaters() {
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next_max6675_ms[hindex] = ms + MAX6675_HEAT_INTERVAL;
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#if ENABLED(MAX6675_IS_MAX31865)
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max6675_temp = int(max31865.temperature(100, 400)); // 100 ohms = PT100 resistance. 400 ohms = calibration resistor
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max6675_temp = int(max31865.temperature(MAX31865_SENSOR_OHMS, MAX31865_CALIBRATION_OHMS));
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#endif
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//
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